The document, based on research conducted by over 300 buyers of meetings and events, is designed to identify trends in London's event sector.
Results show that 75% of respondents believe London's profile is significant for the future of events in the city, with 76% stating that London's role is very important for the events industry.
In catering, 42% felt ethical food production and sourcing was important with the majority believing that standards had increased.
Elsewhere, business travellers reported an increase in Tube use and 35% of people agreed that technology is dictating the planning of events.
Johnson said: "I believe that the capital will emerge from this period of economic uncertainty in a very strong position providing unrivalled opportunities over the coming decades.
"With the recent fall in the value of sterling there has never been a better time to visit London and get great value on every pound, dollar, euro or yuan."
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